Geoffrey Midmore and his friend fist-bump less than an hour after the acid attack.

Midmore’s appeal against his conviction and sentence was rejected by the Lord Chief Justice of England and Wales Lord Thomas, as the Court of Appeal sat at Winchester Crown Court, Hants, for the first time yesterday.

Mark Ruffell, representing Midmore, argued that the court had not adequately questioned whether he was aware of his brother’s intentions on the day of the attack.

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The seven-day trial last year heard how the brothers had visited several DIY stores to purchase a particular brand of drain cleaner called One Shot, which had the highest concentration of sulphuric acid.

Jurors heard how Geoffrey, 27, had sent a photograph of the bottle on WhatsApp to an acquaintance with the words: “This is one face melter”.

Mr Ruffell said: “There is no evidence that Billy knew that the photo was taken. Did he share Geoffrey Midmore’s intention, which is what the crown is relying on?

“Nobody stopped to ask him ‘did you ever discuss this with your brother?’ We were deprived of that opportunity.

“The issue is whether the acid attack was joint enterprise or just something done by Geoffrey Midmore.”